A series has started over on www.dresdenfilesrpg.com excerpting some of the material from the RPG on the Laws of Magic. The series starts here:
http://www.dresdenfilesrpg.com/news/archives/2007/06/the_laws_of_mag.php
And today they’ve posted up the first law (of seven):
http://www.dresdenfilesrpg.com/news/archives/2007/06/the_laws_of_mag_1.php
Check ’em out!